Phase 3: event creation flow (GPS + success / error)

GpsService runs a single-shot position request with a hard timeout
and early-exit when Config.GPS_TARGET_ACCURACY_M is reached.
LoadingView renders a circular progress bar around the edge plus the
"Standort wird bestimmt" prompt; on callback it persists a new Event
via EventStore.add and transitions to SuccessView (green checkmark,
short vibration, auto-close) or ErrorView (red alert, 3× vibration,
German message, longer hold). TextUtils extracts the shared
multi-line centered text rendering so MenuView, LoadingView and
ErrorView all render wrapped German text consistently. Positioning
permission added to manifest.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

source/SuccessView.mc

@@ -0,0 +1,52 @@
+import Toybox.Attention;
+import Toybox.Graphics;
+import Toybox.Lang;
+import Toybox.Timer;
+import Toybox.WatchUi;
+
+// Green checkmark flash after a successful event save. Vibrates
+// briefly, holds for Config.SUCCESS_DISPLAY_MS, then closes the app.
+class SuccessView extends WatchUi.View {
+
+    private var _timer as Timer.Timer;
+
+    function initialize() {
+        View.initialize();
+        _timer = new Timer.Timer();
+    }
+
+    function onShow() as Void {
+        if (Attention has :vibrate) {
+            Attention.vibrate([new Attention.VibeProfile(75, 200)] as Array<Attention.VibeProfile>);
+        }
+        _timer.start(method(:_dismiss), Config.SUCCESS_DISPLAY_MS, false);
+    }
+
+    function onHide() as Void {
+        _timer.stop();
+    }
+
+    function _dismiss() as Void {
+        System.exit();
+    }
+
+    function onUpdate(dc as Dc) as Void {
+        dc.setColor(Config.COLOR_FG, Config.COLOR_BG);
+        dc.clear();
+
+        var cx = LayoutMetrics.centerX(dc);
+        var cy = LayoutMetrics.centerY(dc);
+        var min = LayoutMetrics.minDim(dc);
+        var size = (min * 0.35).toNumber();
+
+        dc.setColor(Config.COLOR_SUCCESS, Config.COLOR_BG);
+        dc.setPenWidth((min * 0.035).toNumber());
+
+        // Checkmark: two line segments forming a tick.
+        var left = cx - size / 2;
+        var right = cx + size / 2;
+        var midX = cx - size / 6;
+        dc.drawLine(left, cy, midX, cy + size / 3);
+        dc.drawLine(midX, cy + size / 3, right, cy - size / 2);
+    }
+}